QImage load JPEGs not working - Qt4.6.3, QtCreator2.0, Ubuntu 9.8
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I installed Qt via the latest download(Open Source Qt 4.6.3 & Qt Creator 2.0) from qt.nokia.com.
I checked my usr/lib/qt4/plugins/imageformats location and it has the same plugins you mentioned.
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I've also got the same problem.
If it makes any difference I've built a number of different versions of qt from 4.5 to 4.6.3 and it has never worked for me. I compile Qt using visual studio 2005 in Windows 7. Although I could download the built libraries from the website I need sqlite support and as such I need to recompile.
Following the previous post I've found this errors between a lot more making references to other image plugins.
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/32bitVSSQL/qt/plugins/imageformats/libqjpeg4.a"
"The file 'C:/Qt/32bitVSSQL/qt/plugins/imageformats/libqjpeg4.a' is not a valid Qt plugin."
not a pluginand then
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/32bitVSSQL/qt/plugins/imageformats/qjpeg4.dll"
In C:/Qt/32bitVSSQL/qt/plugins/imageformats/qjpeg4.dll:
Plugin uses incompatible Qt library
expected build key "Windows msvc debug full-config", got "Windows mingw release full-config"
"The plugin 'C:/Qt/32bitVSSQL/qt/plugins/imageformats/qjpeg4.dll' uses incompatible Qt library. Expected build key "Windows msvc debug full-config", got "Windows mingw release full-config""
not a pluginDoes anybody have some idea? That's something that has been bugging me for a long time.
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bq. Well, that’s why I recompiled qt from visual studio. Shouldn’t the standard configuration compile also the image formats plugins?
That depends on you configuration, make sure Qt was configured with JPEG support. Could it be that you tried building with MSVC in the same directory where you already had a MINGW build, and for some reason, JPEG was disabled in your build? That'll leave stale plugins, which won't load in your newly built Qt.
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I'm getting the same problem on Ubuntu 10.04. QtCreator 4.7.1
Here are details.
http://www.windyweather.net/wp/2011/03/03/qt-4-7-on-ubuntu-lucid-not-loading-jpg-image-plugin/Program sources are available, of course.
Works fine on a system where the tools are installed. On a target system without Qt SDK, libqtcore4 and libqtgui4 packages are installed. Plugins are where the program expects them to be, but only the PNG images work, not JPG images. [haven't checked other formats.]Build system is x86 and target system is x64 if that matters.
Details contains screen shots of plugin folders, lib paths and supported image formats.it says JPG is supported, but program will not load JPG images.
Is this a bug between x86 and x64 systems?
Using x86 build and x64 target works fine on Windows system, but plugins are manually moved in that case rather than using package install.
I'm trying to figure out how to package this program for Deb/Ubuntu systems and I have to get it to work first on system without SDK installed.Do we know what I missed, or is this a bug?
Thanks,
Windy -
Same problem with SDK 1.1.4 .
I'm trying this code:
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QImage image;
qDebug() << QImageReader::supportedImageFormats ();
image.load("/home/luca/immagini_vscam/T0-20111122-223411510.jpg");
qDebug() << image.height();
@but while running I get a "segmentation fault".
The supported formats are:
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("BW", "EPS", "EPSF", "EPSI", "EXR", "PCX", "PSD", "RAS", "RGB", "RGBA", "SGI", "TGA", "XCF", "bmp", "bw", "dds", "eps", "epsf", "epsi", "exr", "gif", "ico", "jp2", "jpeg", "jpg", "mng", "pbm", "pcx", "pgm", "pic", "png", "ppm", "psd", "ras", "rgb", "rgba", "sgi", "svg", "svgz", "tga", "xbm", "xcf", "xpm", "xv")
@I have libjpeg 8 installed in my system and my application is linked to it:
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ldd my_app
linux-gate.so.1 => (0xffffe000)
...
...
libjpeg.so.8 => /usr/lib/libjpeg.so.8 (0xb4991000)
libpng14.so.14 => /usr/lib/libpng14.so.14 (0xb496a000)
libtiff.so.3 => /usr/lib/libtiff.so.3 (0xb4910000)
...
...
libphonon.so.4 => /home/luca/QtSDK/Desktop/Qt/474/gcc/lib/libphonon.so.4 (0xb2f78000)
libQtDBus.so.4 => /home/luca/QtSDK/Desktop/Qt/474/gcc/lib/libQtDBus.so.4 (0xb2ef0000)
libQtXml.so.4 => /home/luca/QtSDK/Desktop/Qt/474/gcc/lib/libQtXml.so.4 (0xb2ea5000)
@